Dynamo-electric machine



J. A. KUYSER.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED OCT. 21. 19:5.

Patented Jan. 27, 1920;

4 SHEETS-SHEET I.

INVENTOR Um; /I. Kuyser WITNESSES ATTORNEY J. A. KUYSER.

DYNAMO ELECTRIC MACHINE.

. APPLICATION FILED OCT. 27, I915. 1,329,247, Patented Jan. 27, 1920.

' 4 SHEETSSHEET 2- WIITNESSES I I BY Y 7A'IT6RNEY INVENTOR c/an A. Kuysar J. A. KUYSER.

DYNAMO ELECTRIC MAQHINE. APPLICATION FILED OCT. 27, 1915- 1,329,247, v Patented Jan. 27, 1920.

4 SHEETS-SHEET 3- I i r i i i I l I INVENTOR I Jan A huyser TTORNEY WITNESSES J. A. KUYSER.

DYNAMU ELECTRIC MACHINE.

APPLICATION FILED OCT. 27. 1915.

1,329,247, Patented Jan. 27, 1920.

SHEETS-SHEET 4. a: 1

INVENTOR Jan /I. Kuyser AITTORNEY 35 I said longitudinal passages are connected.

JAN ARTHUR-KUYSEB, or SALE, ENGLAND,

ASSIGNOR TO WESTINGHOUSE EIIECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA. V

DYNAMIC-ELECTRIC mecrimn.

Application filed' October 27, 1915. Serial No. 58,259.

To-all whom'z't may concern.

Be it known that I, J AN ARTHUR KUYsER,

' a subject of theQueen of Holland, and a resident of Sale, inthe county of Chester, England, have invented a new and use Improvement in Dynamo-Electric Machines,

of which the following is a specificatlon.

with the axis of the machine.

My invention relates to dynamo-electric machines,- and-it has for its object to provide an improved means for ventilating the magnetizable core members of such machines. r A usual means forthe ventilation of a ogre member comprises a plurality of radial ven tilating passages formed by spacing apart certain of the laminae of which such member is composed. Longitud'nal ventilating passages are also formed by able openings in the laminae that are ar ranged to register and thus form continuous channels or passages which extend parallel Various systems have been proposed in which the ventiother radial passages.

ments, the cooling air enters through the lon- "dependently or first gitudinal passag 1 is made to lating medium is caused to pass through the radial and longitudinal passages, either inthrough one and then through others df said passages,

or cooling air-passes first into certain radial passages, then along certain longitudinal passages and finally passes out through In other arrangethen passes out through the radial; passages to which all of es and According to my invention, the cooling air take a path which is diiferent from that employed in. any of the systems heretofore suggested, by causing it to pass first through a longitudinal passage an then through a selected radial passage, the finally discharged into the atmoschine. By this arrangement, the cooling effect is so regulated that an ample supply of air will be provided for all portions of the core member and an even temperature maintained throughout its entire mass. 7

An important advantage which is thus obtained lies in the fact hat each air current will follow a definite path with a freedom from interference by air currents flowing in other parts of the core member.

In the accompanying drawings, Figure 1 Specification of Letters Patent.

n u I .with my invention,

providing suiton a shaft 4 For example,.1n one arrangement, the ventilating is provided, at

"Patented Jan. 27, 1920.

is a front view of a portion of a lamina used in the construction of a core member in accordance with my invention; Fig. 2 is a longitudinal sectional view of a dynamoelectric machine constructed in accordance the section through the laminae-comprising the core member being taken along the line IIII of Fig. 1; Fig. 3 is a sectional view similar to Fig. 2, the section through the laminae being taken along the line'I IL-III of Fig. 1. Fig. 4 is, a front view, similar to Fig. 1, showing a modification in the form of the lamina; Figs. 5 and 6 are sectional views similar to Figs. 2 and 3, respectively, the sections through the laminae being taken along the lines V-V and V-VI of Fig. 4.

Referring to Fig. 2 of the drawings, the stationary member of a dynamo-electric machine comprises'a shell or frame 1 and a plurality of assembled laminae 2 that are secured thereto in any suitable manner. The rotatable member of the machine comprises a plurality of laminae 3 that are mounted in any suitable manner. laminae 2 and 3are assembled in groups between suitable spacing pieces so as to form a number of radialpassages .5 to 13, inclusive. As best shown in Fig. 1, the laminae 2 comprising the stator core are severally provided with openlngs 14 to 18, inclusive,

that are adapted to register when the laminae are assembled so asto form longitudinal assages in the 00%.. Corresponding openmgs are provided in the endplates The endportions of the stator winding 21 are inclosed by end bells 22,'and the rotor each end, with fan blades 23 by means of which air may be forced from the end bell 22 into the longitudinal passages 14 to 18, inclusive, of the stator core and also into the-annular space or air gap 24 between the stator and the rotor. Air

also passes into an annular passage 25 provided in the rotor and from thence through the radial passages 5 to 13, inclusive, an

out into the air gap 24. I The radial passages 5 to 13, inclusive, in

the stator core are not all connected to all of the longitudinal passages 14 to 18, in-

elusive, as the. latter are made continuous by means of tubes 26 that-bridge the radial I passages and connect the oppositely-disposed openings in the laminae forming the side walls of the radial passages. The tubes The 80 radially outward at this point.

ruption may be conveniently effected by filling the openings in the adjacent lamina sages l4 and sage 6. The direction of 26 may project into the openings in the laminae 'or may be united to one of the laminae forming one side of the radial passage, for example, by the process commonly known as spot welding. In the arrangement shown in the drawings, the tubes 26 have a length equal to the width of the radial passages and form spacing pieces which may take the place of, or, be additional to suitable spacing ribs. Where it is desired that a longitudinal passage shall communicate with a radial passage, a semi-cylindrical member may be employed, as shown at 27 to 31, inclusive, in Figs. 2 and 3 forexample, or the tube may simply be omitted at this point. The continuity of the longitudinal passages is interrupted between the radial passages with which the longitudinal passages communicate and the next adjacent radial passages so as to force the air to pass This interby means of suitable disks 32, or special laminae may be provided for those placed in which selected openings are omitted. A longitudinal passage may be connected to more than one radial passage if desired, preferably however, it is connected with one only. The number of longitudinal passages which are connected to each radial passageis determined by the quantity of cooling air that must be supplied to that part of the core in which a particular passage is located, the obj ect being, as hereinbefore stated, to equalize the temperature throughout the entire core, as far as possible.

The selection of certain radial passages for connection to difi'erent longitudinal passages permits of the application of the counter-flow principle to the air currents traversing the core member. As shown in Figs. 1, 2 and 3, for example, the. air coming from the right-hand end of the machine is arranged to pass through the longitudinal passages 18'as far as the radial passage 5, that passing through the longitudinal passages 16 passes out by the radial passage 7 and that passing through the longitudinal passages 14 passes out through the radial passage 9. The air passing through the longitudinal. passages 17 is arranged to pass out by the radial passage 13 and that through the longitudinal passages 15, passes out through the radial passage 11. On the other hand, the air which is supplied from the left-hand end the longitudinal passages 17 and out by the radial passage and out by the passage 10, through the pasout by the passage 8 and through the passages 16 and out by the pasthe air currents is indicated by arrows, and it will be seen that, in general, throughout the stator core coolof the machine passes through 12, through the passages 15 ing air will be flowing through one longit11- dinal passage in one direction and in an adjacent passage in the opposite direction. Obviously, this counter-flow principle can not be conveniently applied to the whole of the stator core. This will be appreciated from a comparison of Figs. 2 and 3 of the drawings; for example, near the right-hand end of the core it will be seen that, in the first two sections of the core, namely, as far as radial passage 12, the air is flowing in the same direction through all the longitudinal passages and this is also true of the first section at the left-hand end of the core; that is to say, from the end plate as far as the radial passage 5. Generally speaking, it will not be necessary to carry the "counterflow principle further because differences of temperature which may arise will be compensated by the heat conductivity of the metal. I

Another method of applying the counterflow principle-is by dividing the longitudinal passages into two sets, the passages of one set alternating with those of the other set, and cooling air being supplied to one set from the other end of the machine. The sets of longitudinal passages respectively communicate with radial passages at the opposite ends of the machine. For example, the longitudinal passages 14:, 16, 18 may be supplied with air from the right-hand end of the machine and communicate with radial passages near the left-hand end, while the longitudinal passages 15 and 17 may be supplied with air from the left-hand end of the machines and communicate with radial passages near the right-hand other methods of arranging the connections between the longitudinal and radial passages may be employed in order to suit particular conditions.

The machine shown in Figs. 4 to 6 difi'ers from that shown in Figs. 1 to 3 only in the arrangement of the openings in the laminae 2, as will be seen from a comparison of Figs. 1 and 4. The arrangement of the connecting tubes 26 and the sequence of the connections between the longitudinal passages and the radial passages whereby the air currents are constrained to flow in opposite directions in adjacent longitu'dinal'passages is substantially the same as that described withreference to Figs. 2 and 3 and need not be further described.

From the foregoing'description, it will be obvious that each unit volume of the core will be supplied with equal volumes of cooling air, since equal volumes of air are supplied to each longitudinal passage, one of which discharges on either side thereof. For each of said longitudinal passages dellvering air to one side of a core unit which 1s longer than the average length of said passages there is an oppositely disposed corend. Various said unit. Thus it at a temperature correspondingly lower than the average, to the same portion of the core, so that the volume and :also the average I temperature of the air delivered to each unit volume of the core is the same, thus causing each unit volume of said core to be supplied with quantities ofair of equal calorific cooling power.

While I have shown my invention in its more simple and preferred forms, it is not so limited but is susceptible of various other modifications within the scope of the, appended claims.

I claim as my invention 1. A magnetizable core member for dynamo-electric machines provided with a plurality of intersecting longitudinal and radial ventilating passa es, certain of said longitudinal passages ing continuous through certain of said radial passages and communicating with others of said radial passa es.

2. n a dynamo-electric machine, the combination w1th a magnetizable core member provided with a plurality of intersecting longitudinal and radial ventilating passages and means for producing air currents, of means embodied in the said core member for causing the air currents flowing through certain of said longitudinal passages to flow across certain of said radial assages and to flow into others of said ra ial passages.

3. In a dvnamo-electrlc machine, the come a l u blnation with a magnetizable core member provided with a plurality rections in adjacent portions 0 of intersecting longitudinal and radial ventilating passages extending therethrough and means for producing air currents, of means embodied in vthe said core member for causing independent air currents to flow in opposite d1- difierent longitudinal passa es.

4. In a dynamo-electric machine, the combination with a magnetizable core member provided with a plurality of intersecting longitudinal and radial ventilating passages extendmgtherethrough and means for producing air currents,.of means embod1ed 1n the said core member for causing the air shorter passage delivering air currents flowing in the same direction in adjacent longitudinal passages to enter different radial passages.

5. In a dynamo-electric machine, the combination With a magnetizable core member provided with a plurality of intersecting longitudinal and radial ventilating passages and means for producing air currents there through, said longitudinal passages being continuous through certain of said radial passages, for causing substantially equal volumes of air to be supplied to all of said longitudinal and radial passages.

6. A magnetizable core member for a dynamo-electric machine provided with a plu-- rality of continuous longitudinal passages intersecting a plurality of radial passages and means whereby said-longitudinal passages are caused to communicate with certain of said radial passages and to intersect the remainder of said radial passages without communicating therewith.

-7. In a dynamo-electric machine, the .combination with a magnetizable core member provided with a plurality of intersecting longitudinal and radial ventilating passages, and means for producing air currents there- 'through, said longitudinal passages commupassages being so disposed and of such crosssection as to deliver equal volumes of air to each unit volume of said core. v

8. In a dynamo-electric machine, the combination with a magnetizable core member provided with a plurality of intersecting longitudinal and radial ventilating passages, of means fpr producing air currents therethrough, said longitudinal passages communicating with certain of said radial passages and intersecting the remainder of said radial passages without communicating therewith and said longitudinal and radial passages being so disposed and of such cross-section as to deliver volumes of air of equal calorific cooling power to each unit volume of said core.

In testimony whereof, I have hereunto subscribed my name this fifth day of October 1915.

Witnesses:

J. S. PECK, F. NIXON. 

